I believe the gun will only bee available once (so be sure you boot up the character that is the right level for what you want the gun for). I'm going to boot up my level 50 Axton, as I know he has backpack space and is level 50.

I'm going based on the precedent set by the Valentines day Shift code, where you go the heartbreaker and Skins. I only ever got the Heartbreaker for one of my characters I think.

Of course, though I've never gotten it before, I assume (like with the Heartbreaker) the Chulainn SMG is available via a mission too.

This weekend is also a higher rate of dropping rarer shields, so nows the time to farm for those Bee's and Sham's! (Also a higher absorb rate for the Vladof shields and a higher booster drop rate for the Dahl shields)

Well for me it seems to only be green shields, tieing in with the theme nicely but a waste of time for me. I just swapped loot with someone and got far better stuff in 10 minutes than I would have got if I spent all weekend farming for it....